Talk:Electrical impedance
This 20 June 2014 "simplification" is NOT simpler
changeThe change done on 17:17, 20 June 2014 replaces a whole page with two paragraphs using complex words such as "amplitude" and "phase" with no explanation, no pictures, no links, making the explanation for the word "impedance" much harder to understand to anybody not already already familiar with the word. The proposed text has errors and/or is misleading and/or is meaningless, for example "Impedance is more complex measure" (impedance is not a "measure"), "includes the effect of capacitance and inductance" (false in many ways, capacitance and inductance has an impedance, not the other way around), "can be a complex number" (very few with common math knowledge will understand that. Even with an angle of zero, Z is complex). The previous version was starting from simple ideas to more advanced ones, and has seen many changes since 2010, but all that has been destroyed.
This "simplification" is NOT simpler, it's not because it has less words that it's simpler to read, and more importantly, simpler to understand.
The first sentence was salvaged though, with corrections: Electrical impedance is the amount of opposition that a circuit presents to current or voltage change. Joc (talk) 14:49, 5 July 2014 (UTC)
This page is a little too complex for simple.wikipedia, IMO.
It's hard to understand
changeMy english is not perfect to read this article--158.181.25.10 (talk) 15:40, 20 June 2014 (UTC)
- I totally agree with both these users. At the moment we don't have a physics expert to clarify the page. Macdonald-ross (talk) 17:11, 20 June 2014 (UTC)
AC / DC
changeDid I infer correctly that impedance is only relevant for AC circuits? Yes or no, it would be nice to have a clarification in the article.
82.198.218.209 (talk) 14:29, 11 April 2016 (UTC)
The impedance is valid at any frequency, including DC. I've expanded one paragraph with:
- As indicated by the formulas above, the impedance varies depending on the frequency, for example, at zero Hertz, or DC, the impedance of the inductor is zero, the same as a short-circuit, and the impedance of the capacitor is infinite, the same as an open-circuit. Most signals are the sum of many sine waves at various frequencies (see the fourier transform for more details), and each of them experience a different impedance.